Finding the Fourth Proportional to 20,488.63, 30,744.89 and 8,641.68

Step by Step Solution

1. Step 1: Write the proportion equation
   20,488.63 : 30,744.89 = 8,641.68 : x
2. Step 2: Convert to fraction form
   20,488.63/30,744.89 = 8,641.68/x
3. Step 3: Cross multiply
   20,488.63x = 30,744.89 × 8,641.68
4. Step 4: Simplify right side
   20,488.63x = 265,687,501.02
5. Step 5: Solve for x
   x = 265,687,501.02/20,488.63
6. Step 6: Final answer
   x = 12,967.56